Shaft milling and grinding machine



Aug. 15, 1944. o. D. PREMO SHAFT MILLING AND GRINDING MACHINE Origi nal Filed Nov. 13, 1940 5 Sheets-Sheet l Aug. 15, 1944. PREMO SHAFT MILLING AND GRINDING MACHINE ori inal Filed Nov. 15, 1940 5 Sheets-Sheet 3 m ivk wk a 4% ,2 55 w 9% 1: m

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Aug. 15 Q 13, PREMQ 2,355,750

SHAFT MILLING AND GRINDING MACHINE Original Filed Nov. 13, 1940 5 Sheets-Sheet 4 nvwsuron Patented Aug. 15, 1944 SHAFT AND GRINDING MACHINE Owen D. Premo, Muskegon Heights, Mich.

Original application November 13, 1940, Serial No. 365,535. Divided and this application October 17, 1941, Serial No. 415,463

2 Claims.

This invention relates to a shaft milling and grinding machine and is a division of my copending application filed November 13, 1940,

Serial No. 365,535 th primary object of the invarious types of curved surfaces.

Another important object of the inventionis to provide a machine of this character including a special arrangement of gearing which will cause the cutter to rotate in a direction to equalize the cutting forces.

Still another object of the invention is to provide a machine which may be usedin accurately forming molding from metal or wooden bar stock.

With the foregoing and other objects in view,

which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it

being understood that changes in the precise embodiment of the invention herein described,

may be made within the scope of what is claimed,

without departing from the spirit of' the invention.

Referring to the drawings:

Figure 1 is a side elevational view illustrating a modified form of the invention.

Figure 2 is asectional view taken on line 2-2 of Figure 1. v

Figure 3 is an end elevational view of a still further modified form of the invention wherein the machine is used for milling or grinding the flat surfaces of rectangular objects.

Figure 4 is a sectional view taken on line 44 of Figure 3.

Figure 5 is another modified form of the invention, illustrating curved grinding and cutting members used in forming molding or similar curved surfaces on bar stock.

The body portion of thedevice, which is indi- I cated by the reference character 42 is box-like in formation, and is rovided with openings in the ends thereof for the'reception of the bushing supports 43, in which the bushings 44 are.

mounted. These bushings 44 are of a removable character, to suit the shape of work to guide the work through the machine.

The body portion is formed with an integral wall 45 providing a housing for the cutters 46 that are mounted on the inner ends-of the shafts 41 that have their outer end extended into openings formed in the walls of the body portion. Pairs of shafts 48' are also positioned in the openings formed in the walls of the body portion, and are provided with thrust bearings at their inner ends that engage the outer ends of the shafts 41, as clearly shown by Figure 2 of the drawings. The bearings 48 provide stops against which the coiledsprings 49 engage. The

outer ends of the coiled springs rest against the adjusting nuts 50 which are mounted on the.

annular flanges 5|, and which are threaded to receive said adjusting nuts. As shown by Figure 2, sufficient clearance is provided between the adjusting nuts and the annular flanges 5|, to permit of rotary movement of the adjusting nuts to exert pressure on the coiled springs, tensioning the springs to prevent rotation of the nuts, due to vibrations during the grinding operation. Nuts 48 are disposed on the-threaded ends of the shafts 41 and act to further restrict rotation of the adjusting nuts50. Suitable graduations are formed on the adjusting nuts 50, as shown by Figure 1 of thedrawings, the graduations cooperating with the indicators, 52, providing a micrometer adjustment for the cutters.

Theseadjusting nuts 50 are provided with teeth 53 that are engaged by the teeth of the rack bars 54, the rack bars being of lengths to operate the adjusting nuts on each side of the body portion, simultaneously. These rack bars '54 move through the guides 55 that are formed on opposite sides of the body portion. An adjusting screw 56 is associated with each rack bar, and is positioned in a threaded bore formed in one end of the rack bar, the adjusting screws being formed with finger pieces 51, whereby the adjusting screws and rack bars may be readily moved to rotate the adjusting screws to accomplish the purpose of the invention.

As. will be clearly seen by an examination of Figure 2 of the drawings, the shafts 4? are arranged in pairs at opposite sidesof the body porthat are keyed to the main gear 6| rotated by the power shaft 62.

Since the gears 59, 60 and BI are encased in the body portion, it will be seen that a single oil bath will serve to lubricate all of the gears of the machine.

In the modified form of the invention as illustrated by Figures 3 and 4 of the drawings, the machine has been; especially constructed for use in milling or grinding bar material ofrectangular formation.

In this form of the invention, the body portion of the machine is indicated by the reference character 63 and is formed with openings in which the bushings 64 are mounted, the bushopposite directions.

Thus it will be seen that when the machine is set in motion and a bar to be treated is fed through the machine, the tools which are rapidly ings 64 being of a shape or formation to receive the bar under treatment, which in the present showing is indicated by the reference character 65.

The reference character 66 designates the tool' I supports, each of which embodies spaced arms between which the tools,;61, aremounted, which in the present showing are in the form of grinding cylinders. Each tool support 66 is formed with an extension 68 fitted in a bushing 69, that in turn is positioned in an. opening formed in the Wall of the body portion. As shown, each of these bushings has a threaded extension for the reception of the nut I0, associated therewith.

Keys indicatedat 'll are formed on the extensions 68 and move in .guideways, formed inthe bushings 69, so that rotary movement of the tool supports will be prevented, but at the same time the tool supports will be permitted to slide longitudinally of the bushings, for purposes to be hereinafter more fully described.

. Threaded shanks I2 are formed on the extensions .68, and pass through openings formed in the nuts I0, where they are supplied with nuts I3, to stop inward movement of tool support 66. Coiled springs indicated at I4 are disposed between the free ends of the extensions 68 and inner surfaces of the'nuts 10', the action of the springs being to normally urge the tool supports 66, in wardly towards the work.

Teeth are formed'in the peripheries of the nuts "10, which teeth are engaged by worms formed on the shafts I5 that are mounted in bearings at the sides of the body portion, the ends of the shafts adjacent to the forward endof the machine, being supplied with'knobs I6 whereby the shafts I5 may be rotated to rotate the nuts I0. It will be seen that as the nuts .are rotated, the tension of the springs I4 will be regulated resulting in the adjustment of the tools. Graduations are formed adjacent to the knobs I6, and cooperate with the indicators .11 carried by the knobs, so that :the shafts may be accurately. rotated, predetermined degrees. The power shaft is indicated bythe'reference character I8 and is mounted in bearings formed in the side walls of the body portion, one end of the power shaft I8 being extended beyond one wall of the body portion, where 'it supports the gear I9 that meshes with the gear-80 carried on one end of the shaft BI, the gears 1.9 and 80 operating to rotate the shafts in opposite directions.

Mounted on the shaft I8, are sleeves 82 and 83, the sleeves being secured to the shafts to rotate therewith. These sleeves 82 and 83 are formed with worms 84 that mesh with the teeth of the gears 85 that are secured at the ends of the shafts on which the cutting tools operate, to rotate the cutting tools. The wormsare pitched .in opposite directions, so that rotary movement adjustedwith respect to each other to the end that a particular type of work may be accomplished.

It will also be noted that by adjusting the nuts 13, the tools may be adjusted independently of each other. v A still'further modified form of the invention is illustrated by Figure 5 of the drawings, the structure shown by Figure 5 being particularly designed for use in milling or forming moldings or the like; I

The body'po'rtion of the machine is indicated by the reference character 89, and is provided with openings inlthe side walls thereof for the reception of the bushings 90, the bushings being formed with slots for the reception of the keys 9I formed on the extensions 92 of the tool supports 93.: Thesetool supports 93 are substantially the same as shown in Figure 4 of the drawings, and

are forced inwardly by means of the coiled.

springs 94 that bear against the outer ends of the extensions 92 and engage the adjusting nuts 95 that are rotated by means of the worms 96 formed on the shafts 91. The tools in this particular showing, are formed with irregular surfaces to form correspondingly shaped sides on the material passed through the machine.

The material, which may be in bar form, is fed between the tools, through the openings 98 formed in the sides of the body portion 89.

.These tools are mounted on the shafts 99 that operate in bearings formed in the tool supports, as clearly shown by Figure 5;

On the extended ends of the shafts 99, are pinions I00 that mesh with the pinions ID! that are splined on the power shaft I02, the pinions IllI being urged'towards the pinions I00, by the coiled springs I03, that are shown as hearing against the pinions ml, the opposite ends of the coiled springs engaging the stops I04 that are securedto the power shaft I02. Since the pinions IOI are splined on the power shaft I02, movement of the tools towards or away from the work, may be compensated for by the action of the coiled springs I03 which maintain the pinions IOI and I00 in mesh, It will also be noted that these pinions may be readily moved out of engagement with each other, should it be desired to change the tools for various types of work, zhelreby providing for ready interchanging of the In view of the foregoing detail disclosure it is believed that a further'description as to the operation of the device'is unnecessary.

What is claimed is:

1. A machine of the class described, comprisng a body portion, a plurality of shafts extending into the body portion from opposite sides of of said shaftsand between which the work is fed, toothed nuts on the shafts, an adjusting screw mounted on each side of the body, a rack bar mounted on each side of the body and having a threaded bore, said threaded bores adapted to receive the adjusting screws, said rack bars adapted to engage the teeth of the nuts whereby the grinding tools at each side of the body portion may be adjusted towards and away from each other simultaneously, and means for rotating said grinding tools.

2. In a grinding machine of the class described, a body portion, pairs of shafts extending into the body portion from opposite sides thereof, grinding members mounted on the inner ends of the shafts, adjusting nuts at the outer ends of the shafts, said adjusting nuts having teeth formed in the peripheries thereof, a horizontal rack bar mounted at each side of the body, said rack bars being in mesh with the teeth of said adjusting nuts, said rack bars having longitudinally threaded bores extending inwardly from one of the ends thereof, said adjusting screws being disposed within the threaded bores and adapted to move the shafts of each pair of shafts simultaneously towards and away from the work.

OWEN D. PREMO. 

